Students read an introduction to the lab equipment used to contain and dispense chemicals. A quiz completes the activity.

In this interactive and animated object, students distribute the valence electrons in simple covalent molecules with one central atom. Six rules are followed to show the bonding and nonbonding electrons in Lewis dot structures. The process is well illustrated with eight worked examples and two interactive practice problems.

Learners view illustrations showing the direct dependence of the volume of a gas on temperature and consider the relationship between the Kelvin and Celsius temperature scales.

Learners convert units used to designate pressure. Units for pressure are atm, mm Hg, torr, and pascal.

Students use the pyramid method to solve percent problems. The pyramid grid provides a visual way to set up the equation.

Students read how to determine and calculate the dry density for a given sample of soil or aggregate based on the mass-volume relationship.

Students read how to determine and calculate the saturated density for a given sample of soil or aggregate, based on the mass-volume relationship. Practice problems complete the activity.

Learners follow a four-step process to determine the empirical formula of a compound from the masses of its constituent elements. The molecular formula is determined in a fifth step using the molecular weight of the compound.

Students interpret pie chart information and identify the parts of a chart in an interactive exercise.

Match the fraction with the correct percent

Gravitational Potential energy, Kinetic energy and Law of Conservation of energy questions

Change the Fractions to percents

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